2010 Epson Stylus Pro 4900 / 4910 Service & Repair Manual (P/N SEIJ10007)

• Covers the Epson Stylus Pro 4900 and 4910 17-inch (A2) large-format color inkjet printers, including the 11-cartridge ink system, Photo Black/Matte Black selector, roll-feed and ASF cassette mechanisms, auto cutter, and optional SpectroProofer.
• Epson publication SEIJ10007, Revision A, first released October 8, 2010; 441-page PDF. The manual is arranged as six service chapters plus an appendix rather than as an operator-level guide.
• Troubleshooting follows maintenance requests, service-call codes, print-quality symptoms, paper-feed faults, inoperative-printer conditions, abnormal operation, and SpectroProofer errors through cause, check-item, and remedy pathways.
• Removal and installation coverage is organized through ten disassembly-flowchart groups for consumables and housing, electrical boards, carriage and paper-feed mechanisms, ASF and roll units, cutter, ink system, and SpectroProofer assemblies.
• Adjustment procedures cover NVRAM backup and restore, firmware installation, counter resets, CR/PF belt work, platen-gap and sensor positioning, head ID and slant alignment, Auto Bi-D, ink-system checks, media-feed correction, motor/encoder diagnosis, and SpectroProofer calibration.
• Electrical reference material provides separate Main Body and SpectroProofer block wiring diagrams plus twelve connection-diagram sections for the housing, circuit boards, carriage, paper-feed, ASF, roll, cutter, ink-system, and color-measurement assemblies.

Factory Service Scope

The opening chapters identify the printer configuration before repair work begins. Along with the 17-inch media path and 11-color pigment-ink layout, the manual covers the dual-black ink selector, independent ink-suction arrangement, AID automatic missing-dot detection, USB and Ethernet hardware, control-panel functions, and the PXBMB1/PX17MB1 maintenance-box specification. Setup, Maintenance, and Serviceman Mode maps show what can be checked from the panel and which operations rely on the separate Service Program.

The optional SpectroProofer is treated as a repairable subsystem, not as a passing accessory note. Coverage extends to the mounter, color measurement device, white calibration tile holder, selectable backing, Main-C Board, CR motor and home-position sensor, paper-pressing motor and encoder, thermistor, and drying fan. The adjustment chapter also addresses colorimetric calibration, sensor and movement checks, measurement-precision testing, and serial-number input for the unit.

Troubleshooting and Component Repair

Chapter 2 starts with preliminary checks, NVRAM history review, and test-print evaluation, then routes faults by symptom or displayed code. The service-call matrix covers carriage, paper-feed, ink-supply, APG, roll-feed, release, cutter, ASF, edge-guide, AID, head, board-communication, firmware, NVRAM, and power-supply failures. Separate tables address nozzle clogging, banding, smearing, color inconsistency, paper jams and skew, incorrect cut position, network recognition, abnormal noise, and failed color measurement.

These diagnostic paths do more than name a suspected part. They connect the fault to connector locations, sensor or encoder checks, motor measurement, belt or feed adjustment, NVRAM data, and the related removal page. That helps determine whether a repair points to a CR Encoder, PF Scale, Main Board, SUB board, IS Unit, Ink Selector, cutter mechanism, or complete printer mechanism before parts are ordered.

Chapter 3 provides parts diagrams and removal/reassembly procedures for the housing, Main, Network, Power Supply, SUB-series, and AID boards; CR Unit and belt; PF motor and scale; suction fan; paper sensors; ASF rollers; ATC and roll-feed motors; cutter drive; Printhead; IS Unit; wiper and cap; cartridge holders; ink tubes; Head FFC; decompression pump; and SpectroProofer components. The frame, platen, and PF shaft are a stated service limit: Epson prohibits their disassembly because those parts are factory-aligned to fine tolerances.

Adjustments, Tools, and Reference Diagrams

Repair-dependent adjustment tables identify what must be checked after each component is removed or replaced. Procedures include FFC position verification, CR speed initialization, Active Damper adjustment, nozzle cleaning, CR/PF head-slant alignment, ink eject and initial charge, ILS/CSIC checks, tube cleaning, leak inspection, Rear AD adjustment, PW and top/bottom/side detection, cut-position correction, suction calibration, USB/network communication checks, Motor Measurement Adjustment, Sensor Check, and Encoder Check. NVRAM read/write functions cover both the printer and the SpectroProofer EEPROM, while the viewer documents life-part counters, utilization history, and stored error history.

The manual names the required Epson adjustment tooling and part numbers, including Sonic Tension Meter U-507 P/N 1294120, paper-thickness tools 1424364 and 1282355, PG height jigs 1543007, 1507506, and 1507277, Standard Sheet 1476228, and Cleaning Cartridge 1537913. Its service-software instructions reflect the original Windows XP/Vista/7 environment over USB or network; the high-precision ID adjustment tool is identified as separately supplied from the Service Program.

Useful appendix references include the Main Body Block Wiring Diagram, SpectroProofer Block Wiring Diagram, Carriage Mechanism Connection Diagram, Paper Feed Mechanism 1 and 2, Ink System Mechanism 1 and 2, and SpectroProofer Connection Diagram, followed by the full panel-menu map. The manual also flags two repair traps worth noting: angled FFC insertion can short and damage board circuitry, while damaged, contaminated, or omitted O-rings at ink-path joints can cause leakage. Because the power switch is on the secondary side of the circuit, unplug the AC cable and follow the manual’s electrical-isolation precautions before internal service.